database - physical model data types -


i'm trying convert logical model physical model , saw example here http://www.1keydata.com/datawarehousing/data-modeling-levels.html doesn't have null or not null. next data types, null or not null need in physical model ?...also see lot varchar2(30) in models, know depends on situation of course when have varchar2(50) ? want when have column description, location or street address ?


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